struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask) { struct crypto_alg *alg; alg = crypto_alg_mod_lookup(name, type, mask); if (IS_ERR(alg)) return alg; if (alg->cra_type == &crypto_aead_type) return alg; if (!alg->cra_aead.ivsize) return alg; crypto_mod_put(alg); alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, mask & ~CRYPTO_ALG_TESTED); if (IS_ERR(alg)) return alg; if (alg->cra_type == &crypto_aead_type) { if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) { crypto_mod_put(alg); alg = ERR_PTR(-ENOENT); } return alg; } BUG_ON(!alg->cra_aead.ivsize); return ERR_PTR(crypto_nivaead_default(alg, type, mask)); }
static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn, const char *name, u32 type, u32 mask) { struct crypto_alg *alg; int err; type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); type |= CRYPTO_ALG_TYPE_AEAD; mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV; alg = crypto_alg_mod_lookup(name, type, mask); if (IS_ERR(alg)) return PTR_ERR(alg); err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); crypto_mod_put(alg); return err; }
static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask) { struct crypto_alg *alg; alg = crypto_alg_mod_lookup(name, type, mask); if (IS_ERR(alg)) return alg; if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_GIVCIPHER) return alg; if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : alg->cra_ablkcipher.ivsize)) return alg; return ERR_PTR(crypto_givcipher_default(alg, type, mask)); }
static struct crypto_instance *crypto_ccm_alloc_common(struct rtattr **tb, const char *full_name, const char *ctr_name, const char *cipher_name) { struct crypto_attr_type *algt; struct crypto_instance *inst; struct crypto_alg *ctr; struct crypto_alg *cipher; struct ccm_instance_ctx *ictx; int err; algt = crypto_get_attr_type(tb); if (IS_ERR(algt)) return ERR_CAST(algt); if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) return ERR_PTR(-EINVAL); cipher = crypto_alg_mod_lookup(cipher_name, CRYPTO_ALG_TYPE_CIPHER, CRYPTO_ALG_TYPE_MASK); if (IS_ERR(cipher)) return ERR_CAST(cipher); err = -EINVAL; if (cipher->cra_blocksize != 16) goto out_put_cipher; inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); err = -ENOMEM; if (!inst) goto out_put_cipher; ictx = crypto_instance_ctx(inst); err = crypto_init_spawn(&ictx->cipher, cipher, inst, CRYPTO_ALG_TYPE_MASK); if (err) goto err_free_inst; crypto_set_skcipher_spawn(&ictx->ctr, inst); err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0, crypto_requires_sync(algt->type, algt->mask)); if (err) goto err_drop_cipher; ctr = crypto_skcipher_spawn_alg(&ictx->ctr); /* Not a stream cipher? */ err = -EINVAL; if (ctr->cra_blocksize != 1) goto err_drop_ctr; /* We want the real thing! */ if (ctr->cra_ablkcipher.ivsize != 16) goto err_drop_ctr; err = -ENAMETOOLONG; if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)", ctr->cra_driver_name, cipher->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto err_drop_ctr; memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC; inst->alg.cra_priority = cipher->cra_priority + ctr->cra_priority; inst->alg.cra_blocksize = 1; inst->alg.cra_alignmask = cipher->cra_alignmask | ctr->cra_alignmask | (__alignof__(u32) - 1); inst->alg.cra_type = &crypto_aead_type; inst->alg.cra_aead.ivsize = 16; inst->alg.cra_aead.maxauthsize = 16; inst->alg.cra_ctxsize = sizeof(struct crypto_ccm_ctx); inst->alg.cra_init = crypto_ccm_init_tfm; inst->alg.cra_exit = crypto_ccm_exit_tfm; inst->alg.cra_aead.setkey = crypto_ccm_setkey; inst->alg.cra_aead.setauthsize = crypto_ccm_setauthsize; inst->alg.cra_aead.encrypt = crypto_ccm_encrypt; inst->alg.cra_aead.decrypt = crypto_ccm_decrypt; out: crypto_mod_put(cipher); return inst; err_drop_ctr: crypto_drop_skcipher(&ictx->ctr); err_drop_cipher: crypto_drop_spawn(&ictx->cipher); err_free_inst: kfree(inst); out_put_cipher: inst = ERR_PTR(err); goto out; }
static int async_encrypt(struct ablkcipher_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; struct blkcipher_desc desc = { .tfm = __crypto_blkcipher_cast(tfm), .info = req->info, .flags = req->base.flags, }; return alg->encrypt(&desc, req->dst, req->src, req->nbytes); } static int async_decrypt(struct ablkcipher_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; struct blkcipher_desc desc = { .tfm = __crypto_blkcipher_cast(tfm), .info = req->info, .flags = req->base.flags, }; return alg->decrypt(&desc, req->dst, req->src, req->nbytes); } static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) { struct blkcipher_alg *cipher = &alg->cra_blkcipher; unsigned int len = alg->cra_ctxsize; if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && cipher->ivsize) { len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); len += cipher->ivsize; } return len; } static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm) { struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; crt->setkey = async_setkey; crt->encrypt = async_encrypt; crt->decrypt = async_decrypt; if (!alg->ivsize) { crt->givencrypt = skcipher_null_givencrypt; crt->givdecrypt = skcipher_null_givdecrypt; } crt->base = __crypto_ablkcipher_cast(tfm); crt->ivsize = alg->ivsize; return 0; } static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) { struct blkcipher_tfm *crt = &tfm->crt_blkcipher; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1; unsigned long addr; crt->setkey = setkey; crt->encrypt = alg->encrypt; crt->decrypt = alg->decrypt; addr = (unsigned long)crypto_tfm_ctx(tfm); addr = ALIGN(addr, align); addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); crt->iv = (void *)addr; return 0; } static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) { struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; if (alg->ivsize > PAGE_SIZE / 8) return -EINVAL; if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) return crypto_init_blkcipher_ops_sync(tfm); else return crypto_init_blkcipher_ops_async(tfm); } static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) __attribute__ ((unused)); static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) { seq_printf(m, "type : blkcipher\n"); seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize); seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize); seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize); seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?: "<default>"); } const struct crypto_type crypto_blkcipher_type = { .ctxsize = crypto_blkcipher_ctxsize, .init = crypto_init_blkcipher_ops, #ifdef CONFIG_PROC_FS .show = crypto_blkcipher_show, #endif }; EXPORT_SYMBOL_GPL(crypto_blkcipher_type); static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn, const char *name, u32 type, u32 mask) { struct crypto_alg *alg; int err; type = crypto_skcipher_type(type); mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV; alg = crypto_alg_mod_lookup(name, type, mask); if (IS_ERR(alg)) return PTR_ERR(alg); err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); crypto_mod_put(alg); return err; } struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl, struct rtattr **tb, u32 type, u32 mask) { struct { int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen); int (*encrypt)(struct ablkcipher_request *req); int (*decrypt)(struct ablkcipher_request *req); unsigned int min_keysize; unsigned int max_keysize; unsigned int ivsize; const char *geniv; } balg; const char *name; struct crypto_skcipher_spawn *spawn; struct crypto_attr_type *algt; struct crypto_instance *inst; struct crypto_alg *alg; int err; algt = crypto_get_attr_type(tb); err = PTR_ERR(algt); if (IS_ERR(algt)) return ERR_PTR(err); if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) & algt->mask) return ERR_PTR(-EINVAL); name = crypto_attr_alg_name(tb[1]); err = PTR_ERR(name); if (IS_ERR(name)) return ERR_PTR(err); inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) return ERR_PTR(-ENOMEM); spawn = crypto_instance_ctx(inst); /* Ignore async algorithms if necessary. */ mask |= crypto_requires_sync(algt->type, algt->mask); crypto_set_skcipher_spawn(spawn, inst); err = crypto_grab_nivcipher(spawn, name, type, mask); if (err) goto err_free_inst; alg = crypto_skcipher_spawn_alg(spawn); if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_BLKCIPHER) { balg.ivsize = alg->cra_blkcipher.ivsize; balg.min_keysize = alg->cra_blkcipher.min_keysize; balg.max_keysize = alg->cra_blkcipher.max_keysize; balg.setkey = async_setkey; balg.encrypt = async_encrypt; balg.decrypt = async_decrypt; balg.geniv = alg->cra_blkcipher.geniv; } else { balg.ivsize = alg->cra_ablkcipher.ivsize; balg.min_keysize = alg->cra_ablkcipher.min_keysize; balg.max_keysize = alg->cra_ablkcipher.max_keysize; balg.setkey = alg->cra_ablkcipher.setkey; balg.encrypt = alg->cra_ablkcipher.encrypt; balg.decrypt = alg->cra_ablkcipher.decrypt; balg.geniv = alg->cra_ablkcipher.geniv; } err = -EINVAL; if (!balg.ivsize) goto err_drop_alg; /* * This is only true if we're constructing an algorithm with its * default IV generator. For the default generator we elide the * template name and double-check the IV generator. */ if (algt->mask & CRYPTO_ALG_GENIV) { if (!balg.geniv) balg.geniv = crypto_default_geniv(alg); err = -EAGAIN; if (strcmp(tmpl->name, balg.geniv)) goto err_drop_alg; memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); memcpy(inst->alg.cra_driver_name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); } else { err = -ENAMETOOLONG; if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", tmpl->name, alg->cra_name) >= CRYPTO_MAX_ALG_NAME) goto err_drop_alg; if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", tmpl->name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto err_drop_alg; } inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV; inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; inst->alg.cra_priority = alg->cra_priority; inst->alg.cra_blocksize = alg->cra_blocksize; inst->alg.cra_alignmask = alg->cra_alignmask; inst->alg.cra_type = &crypto_givcipher_type; inst->alg.cra_ablkcipher.ivsize = balg.ivsize; inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize; inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize; inst->alg.cra_ablkcipher.geniv = balg.geniv; inst->alg.cra_ablkcipher.setkey = balg.setkey; inst->alg.cra_ablkcipher.encrypt = balg.encrypt; inst->alg.cra_ablkcipher.decrypt = balg.decrypt; out: return inst; err_drop_alg: crypto_drop_skcipher(spawn); err_free_inst: kfree(inst); inst = ERR_PTR(err); goto out; } EXPORT_SYMBOL_GPL(skcipher_geniv_alloc); void skcipher_geniv_free(struct crypto_instance *inst) { crypto_drop_skcipher(crypto_instance_ctx(inst)); kfree(inst); }